wer alkyl group having from 1 to 4 carbon atoms, and n is an integer of 1 or over.The polyarylate-based resin used herein is intended to mean a resin which containing not less than 70 wt % of an improved polyarylate resin defined before.For instance, those mixtures containing not less than 70 wt % of an improved polyarylate resin component of the invention are within the scope of the invention, wh